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입구온도 변화가 중공사형 나피온 막가습기의 성능에 미치는 영향에 대한 연구
황준영(Jun Young Hwang),장효선(Hyosun Chang),강경태(Kyungtae Kang),강희석(Heuiseok Kang) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.4
실험과 수치해석을 이용하여 차량용 PEMFC 시스템의 공기 공급부 운전환경에 따른 막 가습기의 성능 특성에 대한 연구를 수행하였다. Nafion 막을 이용한 Shell-and-Tube 형 막가습기의 입구온도변화에 따른 열 및 물 전달 특성에 알아보기 위한 실험을 수행하였으며, 이로부터 가습기 막을 통한 물전달 성능이 입구 온도에 대하여 비선형적으로 변화하는 특성을 확인하였다. Nafion 막의 물전달 계수를 경계면의 온도와 상대습도의 함수로서 모델링하여 단일 튜브형 막에 대한 수치해석을 수행하였으며, 해석결과를 실험 결과와 비교하였다. 막을 통한 국소물질량유속 분포가 튜브 내에서 급격하고도 비선형적으로 변화하는 해석 결과를 얻을 수 있었으며, 이로부터 입구 온도가 가습기 성능에 미치는 영향을 논의 하였다. The effect of an increase in the temperature of inlet air on the performance of a membrane humidifier for a PEMFC (Polymer Electrolyte Membrane Fuel Cell) vehicle was investigated both experimentally and numerically. A shell-and-tube type gas-to-gas humidifier with Nafion membrane was tested. The experimental result showed that water transfer varies nonlinearly with the temperature elevation. Numerical analysis based on detailed modeling was also conducted in simplified geometry of a single tube to explain this nonlinear behavior. The simulation revealed that the local water flux varies nonlinearly and dramatically along the tube. The analysis was based on the inverse relationship between the increase in temperature and decrease in relative humidity, both of which seriously affect the water conductivity of the membrane.
마이크로 연료전지용 강제 호흡형 공기 공급 모듈에 관한 연구
황준영(Hwang, Jun-Young),윤효진(Yun, Hyo-Jin),이상호(Lee, Sang-Ho),강희석(Kang, Heui-Seok),강경태(Kang, Kyun-Tae) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
The present study conducts a series of experiments to develop a novel air supplying module for a micro fuel cell using piezoelectric linear actuator. An intermittently and operating air breathing module with reciprocating motion of the linear actuator has been suggested in the present study. A test bench for a micro fuel cell system has been constructed to estimate performance of the active fuel cell system using the air supplying module. With the stroke and operating duty as main control parameters, the optimal operating method of the air supplying module has been discussed.
실시간 에지 컴퓨팅을 위한 RGB와 LWIR 영상 융합 기반 강물 영상 분할
황준영(Jun Young Hwang),박지원(Ji Won Park),이연주(Youn Joo Lee),정호기(Ho Gi Jung),서재규(Jae Kyu Suhr) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.11
Recent research has focused heavily on semantic segmentation using only RGB images. However, in adverse weather conditions, such as nights with low light or heavy rain obscuring most objects, the performance of artificial intelligence models can significantly deteriorate. For example, when a model trained solely on RGB images attempts to detect a river under circumstances involving nighttime and rain, it is highly likely to yield poor results. Therefore, this paper proposes a solution by training models robust to such situations through sensor fusion of long-wave infrared (LWIR) images and RGB images.
갑상샘 소포샘종과 소포암에서 세포주기 관련단백과 세포자멸사 관련단백 발현의 의의
황준영(Jun Young Hwang),최유신(Yoo Shin Choi),박성준(Sung Jun Park) 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.76 No.1
Purpose: To explore the role of cell cycle regulators and apoptosis regulators in carcinogenesis of thyroid, the expression of cell cycle related proteins (cyclin D1, Ki-67) and apoptosis related proteins (survivin, caspase 3, bcl-2, p53) were investigated in follicular adenoma and follicular carcinoma of thyroid. Methods: The following formalin-fixed paraffin embedded surgical specimens were immunohistochemically stained by avidin-biotin complex method for cyclin D1, Ki-67, survivin, caspase 3, bcl-2, p53; 15 cases of follicular adenoma (FA), 31 cases of minimally invasive follicular carcinoma (MIFC) and 12 cases of widely invasive follicular carcinoma (WIFC). Results: The overexpression of six gene products in follicular neoplasms of thyroid was noted in varying frequency. Among them, increased Ki-67, caspase 3 index and overexpression of bcl-2 were noted in statistically significant, widely invasive follicular carcinoma than that of follicular adenoma and minimally invasive follicular carcinoma. Conclusion: These results suggest that the overexpression of Ki-67, caspase 3, bcl-2 appear to play an important role during follicular carcinogenesis of thyroid. In addition, the overexpression of these proteins is related to the differentiation of MIFC and WIFC. However, further molecular genetic studies are required to determine the interrelationships between the expression of cell cycle related proteins and apoptosis related proteins.
SO-DCFC 적용을 위한 카본블랙-탄산염 혼합 매개체의 고온 반응 특성에 대한 연구
유준호(Jun Ho Yu),강경태(Kyungtae Kang),황준영(Jun Young Hwang) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.8
직접 탄소 연료전지(DCFC)는 석탄을 비롯한 탄소계 연료의 화학에너지를 직접 전기로 변환시킨다. 특히, 약 10 년 전에 고체산화물 전해질을 사용하고 연료극 매개체로 용융탄산염을 사용하는 고성능 직접탄소 연료전지 시스템이 제안되었다. 이 시스템의 경우, 운전 온도가 증가할수록 고체산화물 전해질의 이온전도도가 향상되고 전기화학 반응이 활성화되어 성능이 향상되나, 연료극 매개체의 화학적인 안정성 문제발생이 우려된다. 본 연구에서는 탄소-탄산염 혼합 매개체의 고온 안정성을 이해하기 위한 일련의 실험을 수행하였다. 질소 또는 이산화탄소 분위기에서 카본블랙과 혼합된 Li₂CO₃ 와 K₂CO₃ 의 TGA 분석을 수행하였으며, 가열 과정에서 시료로부터 생성되는 가스 성분을 분석하였다. 이러한 결과를 해석하기 위하여, 탄산염의 열분해와 탄산염 등에 의하여 가속화되는 탄소 가스화 반응을 고려한 화학반응 모델을 제시하였으며, 실험 결과로부터 구한 매개체의 중량 손실과 가스 생성을 정성적으로 설명하였다. A direct carbon fuel cell (DCFC) generates electricity directly by converting the chemical energy in coal. In particular, a DCFC system with a solid oxide electrolyte and molten carbonate anode media has been proposed by SRI. In this system, however, there are conflicting effects of temperature, which enhances the ion conductivity of the solid electrolyte and reactivity at the electrodes while causing a stability problem for the anode media. In this study, the effect of temperature on the stability of a carbon-carbonate mixture was investigated experimentally. TGA analysis was conducted under either nitrogen or carbon dioxide ambient for Li₂CO₃, K₂CO₃, and their mixtures with carbon black. The composition of the exit gas was also monitored during temperature elevation. A simplified reaction model was suggested by considering the decomposition of carbonates and the catalyzed Boudouard reactions. The suggested model could well explain both the measured weight loss of the mixture and the gas formation from it.
대향류 확산 화염 중에서 비구형 입자 성장에 관한 해석
정재인,황준영,이방원,최만수,정석호,Jeong, Jae In,Hwang, Jun Young,Lee, Bang Weon,Choi, Mansoo,Chung, Suk Ho 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.8
Silica particle formation and growth process including chemical reaction, coagulation and sintering was studied in a counterflow diffusion flame burner. The counterflow geometry provides a one dimensional flow field, along the stagnation point streamline, which greatly simplifies interpretation of the particle growth characteristics. $SiCl_4$ has been used as the source of silicon in hydrogen/oxygen/argon flames. The temperature profiles obtained by calculation showed a good agreement with experiment data. Using one and two dimensional sectional method, aerosol dynamics equation in a flame was solved, and these two results were compared. The two dimensional section method can consider sintering effect and growth of primary particle during synthesis, thus it showed evolution of morphology of non-spherical particles (aggregates) using surface fractal dimension. The effects of flame temperature and chemical loading on particle dynamics were studied. Geometric mean diameter based on surface area and total number concentration followed the trend of experiment results, especially, the change of diameters showed the sintering effect in high temperature environment.